How do you get Afarganyu with the console?

effect create_artifact_afarganyu_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).

What if the owner can't benefit from Afarganyu?

They get Court grandeur baseline +3 instead.

Court artifact · Pedestal Item

Afarganyu

IllustriousUniqueHoly relic

Afarganyu is an illustrious pedestal item artifact in Crusader Kings III: Court grandeur baseline +2, Piety +0.3/month, Temple Buildings Construction Cost -20%, Temple Holding Construction Cost -20%, Development Growth in Drylands +10%, Development Growth in Desert Mountains +10% and 1 more. Quality 100 and wealth 100; maximum durability 150. Patch 1.20.0.3, from game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt.

Quick answers (3)

What does Afarganyu do in CK3?: Court grandeur baseline +2, Piety +0.3/month, Temple Buildings Construction Cost -20%, Temple Holding Construction Cost -20%, Development Growth in Drylands +10%, Development Growth in Desert Mountains +10%, Holding Taxes in Desert Mountains +20% (patch 1.20.0.3).
How do you get Afarganyu with the console?: effect create_artifact_afarganyu_effect = { OWNER = root } — runs the scripted effect that makes it, for the character you play (debug mode).
What if the owner can't benefit from Afarganyu?: They get Court grandeur baseline +3 instead.

This large vessel is where the holy fire, central to many of the ceremonies of the Zoroastrian faith, is lit. An old inscription speaks of the person who originally donated it to the priesthood.

Effects

Court grandeur baseline+2
Piety+0.3/month
Temple Buildings Construction Cost-20%
Temple Holding Construction Cost-20%
Development Growth in Drylands+10%
Development Growth in Desert Mountains+10%
Holding Taxes in Desert Mountains+20%

For an owner who can't benefit from it

The template gives these instead of the effects above when its “can benefit” check fails:

Court grandeur baseline+3

Who can benefit (can_benefit) (3 lines of game script)

zoroastrian_or_syncretic_with_eastern_trigger = {
	CHARACTER = root
}

As written in game/common/artifacts/templates (branch_zoroastr_template).

Counts as a holy relic for (is_holy_relic) (6 lines of game script)

OR = {
	religion = religion:zoroastrianism_religion
	main_rite = {
		rite_has_parameter = eastern_syncretic_actor
	}
}

As written in game/common/artifacts/templates (branch_zoroastr_template).

History and who has it

Made before recorded history.

How it is made

The game creates it with the scripted effect create_artifact_afarganyu_effect. In the console (how to open it), this gives it to the character you play:

effect create_artifact_afarganyu_effect = { OWNER = root }

Built from the effect's file; not run in the game by us.

Also created in event travel_events_fp3.0012.

Source: game/common/scripted_effects/01_exp1_historical_artifacts_creation_effect.txt, common/modifiers (afarganyu_modifier), common/artifacts/templates (branch_zoroastr_template) and the English localisation, Crusader Kings III 1.20.0.3.